I have lived in the deep south for 22 years and it is common to see rapidly changing speed limits on main routes transiting small towns, just anticipate and slow accordingly and you will typically avoid any hassles. There are legit reasons for this, you are moving at 55 but once in the small town need to be at 35 for cars exiting/entering the main transportation corridor.
However, the practices outlined in the attached article have nothing to do with public safety. This police chief and his force are simply "policing for profit". Whenever a public entity can abuse their authority to enrich their particular department without any checks, you have set the stage for corrupt practices. Let's not even get into the unconstitutional aspects of civil asset forfeiture.
A dashcam is your friend and video of any unauthorized stops may limit your exposure to this type of malfeasance.